Methanol fuel supply system, methanol engine and vehicle

Abstract

The utility model discloses a methanol fuel supply system, a methanol engine and a vehicle, the methanol fuel supply system comprises a methanol box, a methanol filter and a methanol pump which are connected in sequence, and an outlet of the methanol pump is respectively connected with a fuel rail and an electromagnetic valve through pipelines; the fuel rail is connected with an engine methanol nozzle, and the electromagnetic valve is connected with a heater methanol nozzle; the fuel supply arrangement mode of the methanol engine and the methanol heater is reconstructed, the fuel supply arrangement mode that the heater and the engine share one set of methanol filter, a methanol pump, related pipeline connection and the like is provided, and the structure is optimized and upgraded aiming at the problem of slow pressure buildup. The related problems that an existing fuel supply system is high in cost, complex in connecting structure, low in sealing reliability, slow in pressure reduction and the like are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol engine fuel supply, and in particular relates to a methanol fuel supply system. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] With the increasing requirements for environmental protection and the rising cost of gasoline and diesel, methanol engines, as a new type of green fuel machine, have obvious advantages and are increasingly valued and promoted on a large scale.

[0004] However, due to the extremely low saturated vapor pressure of methanol at low temperatures, evaporation is slow, and the concentration of the mixed gas is too low to reach the ignition limit. Generally speaking, when the ambient temperature is below 16°C, the methanol engine cannot ignite and start, and it is necessary to add an auxiliary cold start device to solve its low-temperature starting problem. Generally, the coolant inside the engine is preheated in advance to create a high-temperature environment inside the engine, which is conducive to starting the engine. Methanol heaters (water boilers) are put into use because of their easy installation, low price and good effect. At present, for methanol engines and their water preheating devices, there are often two completely independent fuel supply arrangements such as Figure 1 and Figure 2 As shown, this structure has the following problems:

[0005] 1) Both of them independently take alcohol from the methanol tank, but the two sets of parallel and independent pipelines increase the connection length of the pipelines, and also increase the leakage of the interface. The pipeline length increases and the pipeline sealing reliability decreases.

[0006] 2) Two independent supply pipelines, each equipped with a methanol filter and a methanol pump, increase the cost input, and increase the failure rate due to the increase in the number of parts.

[0007] 3) Due to the normally connected structure between the methanol nozzle of the heater and the methanol pump, air is mixed between the methanol nozzle and the methanol pump at the initial stage of startup, resulting in slow initial decompression of the nozzle, which in turn causes low pressure, poor atomization, ignition difficulties, and even liquid alcohol flows to the ignition electrode, causing a short circuit and failure to start. Utility Model Content

[0008] The purpose of the utility model is to provide a methanol fuel supply system, which can reduce connecting pipelines, reduce the number of parts and components, reduce the number of joints, and improve the sealing reliability; at the same time, it can achieve rapid pressure build-up, ensure the rapid responsiveness of nozzle injection, and reduce the occurrence of heater ignition failures.

[0009] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0010] In the first aspect, an embodiment of the utility model provides a methanol fuel supply system, comprising a methanol tank, a methanol filter and a methanol pump connected in sequence, wherein the outlet of the methanol pump is connected to a fuel rail and a solenoid valve respectively through a pipeline; the fuel rail is connected to the engine methanol nozzle, and the solenoid valve is connected to the heater methanol nozzle.

[0011] As a further technical solution, the solenoid valve adopts a normally closed structure.

[0012] As a further technical solution, the solenoid valve is installed on the pipeline between the methanol pump and the methanol nozzle of the heater.

[0013] As a further technical solution, the solenoid valve is installed in front of the heater nozzle, and the solenoid valve and the heater nozzle are integrated into one.

[0014] As a further technical solution, a pressure sensor is arranged on the pipeline in front of the solenoid valve, and both the solenoid valve and the pressure sensor are connected to the ECU.

[0015] As a further technical solution, when the pressure before the solenoid valve reaches the pressure of the methanol nozzle of the heater, the solenoid valve is in an open state.

[0016] As a further technical solution, when the pressure before the solenoid valve does not reach the pressure of the heater methanol nozzle, or when the ignition electrode fails, the solenoid valve is in a closed state.

[0017] As a further technical solution, the fuel rail includes a fuel rail body, which is hollow, with a methanol inlet on one side and multiple methanol outlets on the other side. The methanol inlet is connected to a methanol pump through a pipeline, and an engine methanol nozzle is installed at the methanol outlet.

[0018] In a second aspect, an embodiment of the present utility model provides a methanol engine, comprising the methanol fuel supply system described in the first aspect.

[0019] In a third aspect, an embodiment of the utility model provides a vehicle, comprising the methanol engine described in the second aspect.

[0020] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0021] The methanol fuel supply system provided by the utility model adopts a set of fuel supply routes to replace the two sets of independent fuel supply schemes currently in common use, based on the same structure, the same fuel, the same supply principle, etc. The methanol engine and the methanol heater share a set of methanol tanks, methanol filters, methanol pumps and connecting pipes. A set of methanol filters and methanol pumps are reduced, which reduces costs; a set of connecting pipes is reduced, the number of parts is reduced, and the number of joints is also reduced, which improves sealing reliability; and fuel can be supplied to the methanol engine and the methanol heater at the same time.

[0022] The methanol fuel supply system provided by the utility model solves the problem of slow pressure building caused by the nozzle being always on by controlling the on and off of the fuel by adding an electromagnetic valve; the electromagnetic valve is used to control the on and off of the fuel supplied to the methanol nozzle according to a strategy, and since the electromagnetic valve is a normally closed structure, during shutdown, the fuel in the pipeline between the electromagnetic valve and the methanol pump is always stored in the pipeline, so that the pipeline in front of the methanol nozzle can be quickly pressurized at the initial startup, so as to avoid the occurrence of poor atomization effect due to insufficient initial pressure, resulting in the occurrence of malfunctions such as difficulty in igniting the heater.

[0023] The methanol fuel supply system provided by the utility model can also ensure that when the machine is shut down, the fuel in the methanol circuit between the solenoid valve and the methanol pump is stored by closing the solenoid valve, thereby shortening the pressure building time and ensuring the rapid responsiveness of the nozzle injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 It is the fuel supply system of the existing methanol engine;

[0026] Figure 2 It is the fuel supply system of the existing methanol heater;

[0027] Figure 3 The utility model relates to a methanol fuel supply system.

[0028] The schematic diagram is for illustrative purposes only;

[0029] Among them, 1. Methanol tank; 2. Methanol filter; 3. Methanol pump; 4. Fuel rail; 5. Engine methanol nozzle; 6. Heater methanol nozzle; 7. Solenoid valve. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] Explanation of relevant terms:

[0032] Methanol engine: Similar to gas engine, it is a spark ignition engine that uses methanol as fuel;

[0033] Methanol heater: Similar to diesel heater, it uses methanol as fuel, burns by ignition, and uses the heat energy of combustion to heat the water or air in the water jacket to output hot water or hot air;

[0034] Methanol pump: a power device that sucks in methanol fuel and outputs it at a certain pressure;

[0035] Methanol filter: A filtering device that filters impurities in methanol fuel to a certain degree of cleanliness, thereby preventing clogging of nozzles or pipelines.

[0036] Example 1

[0037] As mentioned in the background technology, the current methanol engines and methanol heaters each use an independent fuel supply system, which has related problems such as high cost, complex connection structure, low sealing reliability, and slow pressure reduction.

[0038] In order to solve the above problems, in a typical implementation of the present invention, Figure 3 As shown, a methanol fuel supply system is provided, comprising a methanol tank 1, a methanol filter 2 and a methanol pump 3 connected in sequence, wherein the outlet of the methanol pump 3 is connected to a fuel rail 4 and a solenoid valve 7 respectively through a pipeline; the fuel rail 4 is connected to an engine methanol nozzle 5, and the solenoid valve 7 is connected to a heater methanol nozzle 6.

[0039] In this embodiment, the solenoid valve 7 adopts a normally closed structure, which is an existing structure. The solenoid valve is set to control the on and off of the fuel to solve the problem of slow pressure building caused by the nozzle being normally open. Since the existing pipeline after the methanol pump is a normally open structure, after shutdown, the fuel between the methanol pump and the methanol nozzle can flow out along the nozzle, causing the pipeline in between to be filled with air, resulting in the need to fill the space in the pipeline before gradually building pressure during its initial startup. Since the solenoid valve is a normally closed structure, during shutdown, the fuel in the pipeline between the solenoid valve and the methanol pump is always stored inside the pipeline, so that the pipeline in front of the methanol nozzle can be quickly built up at the initial startup to avoid the poor atomization effect caused by insufficient initial pressure, resulting in the occurrence of failures such as difficulty in ignition of the heater. In addition, it can also be ensured that when the machine is shut down, the solenoid valve is closed to store the fuel in the alcohol circuit between the solenoid valve and the methanol pump, shorten the pressure building time, and ensure the rapid responsiveness of the nozzle injection.

[0040] In this embodiment, the solenoid valve 7 can be installed on the pipeline between the methanol pump 3 and the heater methanol nozzle 6, or the solenoid valve 7 can be installed in front of the heater nozzle 6. The solenoid valve 7 and the heater nozzle 6 are integrated into one. Either installation method is prior art, and technicians in this field can choose according to their needs.

[0041] In this embodiment, a pressure sensor is provided on the pipeline in front of the solenoid valve 7. The solenoid valve 7 and the pressure sensor are both connected to the ECU. The ECU is an electronic control unit on the vehicle and is an existing mechanism. The ECU obtains the methanol pressure in the pipeline in front of the solenoid valve 7 through the pressure sensor, and controls the opening and closing of the solenoid valve according to the methanol pressure.

[0042] When the pressure before the solenoid valve 7 reaches the pressure of the heater methanol nozzle, the solenoid valve is in an open state.

[0043] When the pressure before the solenoid valve 7 does not reach the pressure of the heater methanol nozzle, or when the ignition electrode fails, the solenoid valve is in a closed state.

[0044] In this embodiment, the fuel rail 4 includes a fuel rail body, which is hollow. A methanol inlet is provided on one side of the fuel rail body, and a plurality of methanol outlets are provided on the other side. The methanol inlet is connected to the methanol pump 3 through a pipeline, and an engine methanol nozzle 5 is installed at the methanol outlet.

[0045] The methanol fuel supply system provided in this embodiment is based on the same structure, the same fuel, the same supply principle, etc., and proposes to adopt a set of fuel supply routes to replace the currently common two sets of independent fuel supply solutions.

[0046] The methanol engine and the methanol heater share a set of methanol tanks, methanol filters, methanol pumps and connecting pipes. This reduces one set of methanol filters and methanol pumps, which reduces costs; it reduces one set of connecting pipes, reduces the number of parts, and also reduces the number of joints, improving sealing reliability; it can supply fuel to the methanol engine and the methanol heater at the same time.

[0047] By adding a solenoid valve to control the on and off of the fuel, the problem of slow pressure buildup caused by the nozzle being always on is solved (because the pipeline behind the methanol pump is a normally on structure, after shutdown, the fuel between the methanol pump and the methanol nozzle can flow out through the nozzle, causing the pipeline in between to be filled with air, resulting in the need to fill the space in the pipeline before gradually building up pressure during initial startup). Therefore, the solenoid valve control strategy is as follows:

[0048] The solenoid valve is open in the following cases:

[0049] 1) The power is turned on and the pressure before the solenoid valve reaches the required pressure P1 of the nozzle, and the ignition electrode is synchronously controlled to start ignition;

[0050] The solenoid valve is closed in the following cases:

[0051] 1) The solenoid valve itself is a normally closed structure when power is off;

[0052] 2) Power on + pressure before solenoid valve < pressure required by nozzle;

[0053] 3) Ignition electrode failure detected.

[0054] The methanol fuel supply system provided by the utility model solves the current problems of slow fuel supply and heater pressure build-up and difficult ignition. At the same time, it not only solves the problems of complex pipelines and poor sealing reliability, but also simultaneously optimizes the configuration, reduces costs, and can be promoted for mass use.

[0055] Example 2

[0056] A typical implementation of the present invention provides a methanol engine, including the methanol fuel supply system described in Example 1.

[0057] Example 3

[0058] A typical implementation of the utility model provides a vehicle, comprising the methanol engine described in the embodiment.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A methanol fuel supply system, characterized in that: It comprises a methanol tank, a methanol filter and a methanol pump which are connected in sequence. The outlet of the methanol pump is connected to a fuel rail and a solenoid valve respectively through a pipeline; the fuel rail is connected to an engine methanol nozzle, and the solenoid valve is connected to a heater methanol nozzle.

2. The methanol fuel supply system according to claim 1, characterized in that: The solenoid valve adopts a normally closed structure.

3. The methanol fuel supply system according to claim 1, characterized in that: The solenoid valve is installed on the pipeline between the methanol pump and the methanol nozzle of the heater.

4. The methanol fuel supply system according to claim 1, characterized in that: The solenoid valve is installed in front of the heater nozzle, and the solenoid valve and the heater nozzle are integrated into one.

5. The methanol fuel supply system according to claim 1, characterized in that: A pressure sensor is arranged on the pipeline in front of the solenoid valve, and both the solenoid valve and the pressure sensor are connected to the ECU.

6. The methanol fuel supply system according to claim 5, characterized in that: When the pressure before the solenoid valve reaches the pressure of the methanol nozzle of the heater, the solenoid valve is in an open state.

7. The methanol fuel supply system according to claim 5, characterized in that: When the pressure before the solenoid valve does not reach the pressure of the heater methanol nozzle, or when the ignition electrode fails, the solenoid valve is in a closed state.

8. The methanol fuel supply system according to claim 1, characterized in that: The fuel rail comprises a fuel rail body, which is hollow, has a methanol inlet on one side and multiple methanol outlets on the other side, the methanol inlet is connected to a methanol pump through a pipeline, and an engine methanol nozzle is installed at the methanol outlet.

9. A methanol engine, characterized in that: It comprises a methanol fuel supply system as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the methanol engine as claimed in claim 9.

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